Disapproving and humourless (2-5)

I think it could be either:

Which length description are you looking for?:

2-5

po-faced

(Other definitions for po-faced that I've seen before include "Looking unamused" , "Informally solemn in appearance, like nocturnal vessel?" , "Glum" , "Wearing a stern expression" , "With a disapproving countenance" .)

I've seen this clue in The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.